Thulium

A chemical element, in the periodic table thulium has the symbol Tm and atom number 69. It is a lanthanide.

Named after Thule, an ancient Roman name for a mythical country in the far north, perhaps Scandinavia. See also Ytterby.

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External Link:
Los Alamos National Laboratory's Chemistry Division: Periodic Table - Thulium

http://pearl1.lanl.gov/periodic/elements/69.html

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Periodic Table